Questions tagged [clamp]

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Implementing A/D conversion circuit to a DIY clamp meter

I was looking for cheap clamp meter projects and found this one: DC non invasive current clamp for oscilloscope DIY. After reading about this project, I noticed that it had a BNC output to read values ...
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1 answer
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Finding DC saturation behavior of clamp ferrites

While some chip ferrite datasheets specify maximum current and DC saturation behavior, it seems like many clamp ferrites omit both maximum current specification (which arguably is less critical) but ...
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1 answer
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Clamp output voltage from DAC

Hi all my analog friends! I have what is probably a very simple problem and I am just overthinking it--but when I work in the analog world, I always feel like I'm missing something. My problem is ...
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4 votes
1 answer
187 views

Is AC current clamp meter accuracy affected by the inner wire curving around the outside?

I have a SCT013-030 current clamp sensor I plan to use to read out the power usage of a mains AC load. It works by wrapping around one of the AC strands of wire to measure the magnetic field. The one ...
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1 vote
1 answer
69 views

Working of a clamper circuit

I was reading about the clamper circuit on wikipedia and found this below image for a positive clamper circuit. My question is During the positive (Rising/increasing portion) half of the input AC ...
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2 answers
192 views

How to prevent voltage spike on Arduino digital pin?

I'm trying to read the state of a switch with an Arduino. The switch is being pushed each time a garage door opens or closes, and is located about 2 meters away from the Arduino. The cables connecting ...
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1 answer
80 views

What are the disadvantages of using an adder instead of a clamper?

I must use an offset an AC signal to measure through ADC. The traditional way or most of the resources point me to use the following clamper circuit: However, I also see that the following adder ...
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  • 801
1 vote
3 answers
418 views

Generating a reference voltage of 1.65V (half of 3.3V)

I am trying to measure an AC voltage using an ADC. However, the ADCs I know only measure the positive voltage. Hence, I am thinking of converting the AD to DC with an offset using the following ...
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1 answer
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clamping the amplitude of a wave to certain level

I'm trying to prevent a wave form from exceeding 10V.p.p. I tried various things, but ... what the correct way to do it? this clamps a 11V signal to +/- 900 mV ... and converts a triangle to square. ...
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1 answer
117 views

Choosing the clamp capacitor of active clamp forward

Does anyone know how to choose the Ccl value? Could you give me some suggestions? I read these Onsemi and TI documents. The formula of Ccl are the same. I have some question about these two ...
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6 votes
7 answers
2k views

Can I build, or is there such a thing as an AC clamp multimeter which does NOT require a line splitter?

I am not an electrician. I need to verify the power consumption (watts) of some home equipment (on 120V or 220V) without disconnecting them or splicing the wires. I would love to be able to walk to ...
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0 votes
1 answer
122 views

Connect 2mm copper wires electrically for 36kHz

I want to build a indoor non-moving Faraday cage against 36kHz electric fields with a 2mm diameter copper wire. I will have several T-junctions where there is a running wire and an end of a wire comes ...
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3 votes
1 answer
271 views

Clamp meter readings

I have a Uni-t UT210e clamp meter. I noticed that when measuring AC current, the reading varies if I move the wire inside the clamp. The measured value displayed on the meter is higher when the wire ...
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-1 votes
1 answer
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How to build an "instantaneous" clamper circuit [closed]

I am asked to clamp a signal 5sin(ωt) V with frequency of 1 kHz to a DC level of 2 V and -4 V. I already built circuits that can do that. But my professor says that the graphs should be exactly like ...
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1 vote
3 answers
70 views

TVS with low Vclamp margin

Thanks for your support in this forum. Currently I have a couple of PCB that I need to provide a double input power supply and transient protection. The specs for this couple of PCB are Vin= 9 to 17....
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0 votes
2 answers
187 views

How do I create a secure clamping circuit?

Clamping is good for transients, e.g voltage peaks. But two issues with clamping is that if you have a linear voltage regulator attached to 3.3v and 3.3v is the voltage regulator output, then that ...
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2 votes
2 answers
125 views

Understanding input bias current in operational amplifier

In order to prevent overvoltages on my arduino voltmeter (more than 20v) I decide to add a protection circuit. As i show in the image i use a AD8605 precision op-amp for the purpose. (https://www....
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2 votes
2 answers
1k views

Measuring RMS power output from audio amplifier channel

I am looking for a simple way for getting the RMS power output of an amplifier channel set to some arbitrary gain. I want this in order to find the maximum level I can safely set the amplifier at for ...
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1 vote
1 answer
241 views

Clamper Circuit Without A Resistor Analysis

simulate this circuit – Schematic created using CircuitLab We were given this clamping circuit and were tasked to plot Vc and Vout for varying input. The only given quantities are the forward ...
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-1 votes
2 answers
72 views

What's the official name for this metal glue clamp for internal wires?

I'm tasked with making a few new pieces of eqipment based on an existing one. This piece uses a few clamps like below to hold wires (usually a few at a time) connecting individual components inside ...
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1 vote
1 answer
516 views

RCD "Clamp/Snubber"

I am attempting to figure out this "RCD Snubber" as seen below: The Eval Sheet says "The resistor capacitor diode (RCD) snubber for the two synchronous rectifiers consists of R3, C29, and D4 for one ...
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0 votes
2 answers
119 views

Identify the Maximum ESD Clamp Voltage on a circuit

This is with regard to a series of my ESD and Inrush Related questions. My circuit : The Node A goes to two other circuits like below : AND Now, I apply an ESD pulse of say 8kV/330pF, the ...
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1 vote
3 answers
938 views

Precision voltage clamping 0V to +5V with +/-12V input

I'm looking for an opamp "voltage clamping" circuit with a +/-12V input and a 0/+5V output. I mean : When input < 0V = output stays at 0V When 0V < input < +5V = output 0 to +5V When input > ...
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1 vote
2 answers
648 views

Clamping circuit output dependence on load resistance

I constructed an unbiased positive clamping circuit with C1 capacitor = 1 uF and load resistances R1 of 100 Ω or 100 kΩ. The ...
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0 votes
2 answers
466 views

How to clamp opamp output to +-12v when supply is +-15v

I have the following circuit. It's purpose is to take a 0-3.3v signal from an MCU and provide a square, -12v to 12v wave across R3, R4 and either R5 or R6. The idea is to read +-9v when only R4 is ...
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1 vote
2 answers
264 views

Multi-Conductor DC Clamp Meter

Does a multi-conductor DC clamp meter exist? Possibly using hall effect sensors in a specific orientation? I typically work with 24-28V DC solenoids valves & pressure transducers with 2 and 4-...
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0 votes
1 answer
47 views

Proper way of connecting wires to pins on polymer films

What is the proper way to connect wires to contacts from a thin semitransparent "plastic" foil (see images). There are slightly different types; the first one with the 4 pins in a row is the more ...
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0 votes
1 answer
72 views

TVS Array Clamping With IO Less than Standoff Voltage

I have 2 IO lines one at +3.000V and the other at -3.000V. They do not turn on simultaneously. Both Voltage levels are off a precision <1%LDO Both lines are connected to a bidirectinoal TVS (...
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5 votes
5 answers
2k views

I am measuring a 9W LED with a clamp on ammeter. Why does it only draw 7.62W?

I bought a UNI T UT210E true rms multimeter. I measured the current of 9 W LED lamp. It shows 0.033A. For the power I get \$0.033 A \cdot 220 V = 7.26 W\$ only. ...
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0 answers
70 views

simple clamp circuit resistor calculation

Hello guys i want to calculate the resistor R in this circuit.Can anybody help me? The value of zener diode(VZ)=4.8 volt. well i try to simplify it My question is is my solution is right??If not ...
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2 votes
2 answers
1k views

TL431 / TLV431 supercapacitor voltage clamping circuit

I have a question regarding a circuit I've been working on for some time. The circuit is based around existing supercapacitor protection modules and uses a TL431 (actually a TLV431 lower power ...
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2 votes
1 answer
145 views

Clamp a D/A to prevent output below 0V

I am using a USB D/A converter to drive a high-voltage op-amp with a signal between 0 and 3V at 10 kHz. The D/A I am using is capable of outputting between -10 and +10 and unfortunately seems to ...
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7 votes
1 answer
376 views

Why is a clamp meter unaffected by nearby wires?

I understand a clamp meter works by measuring the magnetic field generated by current flowing through a wire. It's well known that clamping 2 wires carrying the same current in opposite directions ...
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1 answer
166 views

How to scale +15v/-15v signal to +10v/-5v?

I have a control voltage signal of an audio synthesizer that goes from +15v to -15v and I want to scale it into +10v to -5v. I want to scale its range. How can I do that? I guess a way to do it ...
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2 votes
1 answer
92 views

Looking for a 15kV Zener - or equivalent circuitry

I have a high frequency high voltage module that puts out about 15kV (not the stun gun modules sold on eBay). Because of the circuit design the transformer is damaged if it does not arc over. I am ...
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1 vote
2 answers
168 views

Clipping an AC line voltage

I've got a linear step-up transformer (120V AC input) which has an output that under load nominally supplies 230V AC @ 100mA. But with no load it floats to as high as 280 V. I need to switch the load ...
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4 votes
1 answer
414 views

How to select a diode for a Baker clamp?

What are the requirements when selecting a diode for a Baker clamp circuit? How does the reverse leakage current of the diode affect the circuit? Can a diode with relatively high reverse leakage ...
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0 votes
1 answer
167 views

During DC restoration of a video signal how is the first sync pulse detected?

DC restoration of an AC coupled video signal can be performed by clamping to some reference voltage, during the horizontal sync periods of the video. This all seems fine in a running system, when the ...
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0 votes
1 answer
141 views

Is this current clamp meter measuring correct according to its specs?

A 24V DC power supply is supplying around 2.4A to a pure resistive load. The input voltage is 230Vrms. So I estimated the rms current drawn from the power network as: P/230 = (24*2.4)/230 = 250mA. ...
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